PFIT_CONTROL
tmp = intel_de_read(display, PFIT_CONTROL(display));
if (intel_de_read(display, PFIT_CONTROL(display)) & PFIT_VERT_AUTO_SCALE)
intel_de_read(display, PFIT_CONTROL(display)) & PFIT_ENABLE);
intel_de_write(display, PFIT_CONTROL(display),
intel_de_read(display, PFIT_CONTROL(display)));
intel_de_write(display, PFIT_CONTROL(display), 0);
tmp = intel_de_read(display, PFIT_CONTROL(display));